RUBY NOTES

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Hash

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• 创建方法
  
  • Hash.new
  • Hash.new(default)
  • Hash[k1,v1,k2,v2,...]
  • Hash.new do |h, k| h[k] = **default** end
  • {k1=>v1, k2=>v2, ...}
  • {:s1=>v1, :s2=>v2} == {s1: v1, s2: v2}